Don't create a GXPFactory when blend is SrcOver

src/effects/SkPerlinNoiseShader.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDither.h"
 #include "SkPerlinNoiseShader.h"
 #include "SkColorFilter.h"
@@ skipping 590 matching lines @@
                                                           0.99f);
     SkScalar baseFrequencyY = d->fRandom->nextRangeScalar(0.01f,
                                                           0.99f);
 
     SkAutoTUnref<SkShader> shader(d->fRandom->nextBool() ?
         SkPerlinNoiseShader::CreateFractalNoise(baseFrequencyX, baseFrequencyY, numOctaves, seed,
                                                 stitchTiles ? &tileSize : nullptr) :
         SkPerlinNoiseShader::CreateTurbulence(baseFrequencyX, baseFrequencyY, numOctaves, seed,
                                              stitchTiles ? &tileSize : nullptr));
 
-    GrPaint grPaint;
     return shader->asFragmentProcessor(d->fContext,
                                        GrTest::TestMatrix(d->fRandom), nullptr,
                                        kNone_SkFilterQuality);
 }
 
 GrGLPerlinNoise::GrGLPerlinNoise(const GrProcessor& processor)
   : fType(processor.cast<GrPerlinNoiseEffect>().type())
   , fStitchTiles(processor.cast<GrPerlinNoiseEffect>().stitchTiles())
   , fNumOctaves(processor.cast<GrPerlinNoiseEffect>().numOctaves()) {
 }
@@ skipping 374 matching lines @@
     str->append(" seed: ");
     str->appendScalar(fSeed);
     str->append(" stitch tiles: ");
     str->append(fStitchTiles ? "true " : "false ");
 
     this->INHERITED::toString(str);
 
     str->append(")");
 }
 #endif